Unpacking Negative Externalities of Social Capital in the Sustainability of Smallholder Rural Irrigation Farming: The Case of Rozva Irrigation Scheme in Bikita District, Zimbabwe

The article examines the negative externalities of social capital in the sustainability of smallholder irrigation farming. Smallholder irrigation farming has become one of the main sources of rural livelihood in Zimbabwe given the deficiencies in rainfall triggered by climate change among other factors. The establishment of smallholder irrigation schemes, refurbishment of irrigation infrastructure, introduction of new technology and the subsidization of farm inputs are several initiatives taken by the government of Zimbabwe, Non-Governmental organisations and the private sector to improving agricultural productivity among smallholder irrigation schemes. Despite these efforts, smallholder irrigation farming has remained unsustainable. Resultantly, most rural communities in Zimbabwe continue to face hunger and poverty, two overarching sustainable development goals (SDGs 1 & 2) one and two. This study examined the negative externalities of social capital on efforts to improve productivity and sustainability of Rozva smallholder irrigation scheme. The article argues that linking social capital, which includes partnerships between Rozva irrigation farmers and donor agencies, has created dependency syndrome that is inimical to the sustainability of the irrigation scheme. The article concludes some social connections detrimental to the sustainability of the scheme tend to create divisions among farmers. The article argues there is need for awareness on negative externalities of social capital and reduce these effects on the sustainability of the smallholder irrigation to realise social capital benefits among irrigation farming communities in Zimbabwe.

Influence of Farmer Capacity Building in Financial Resource Mobilization on Performance of Smallholder Irrigation Projects in Migori County, Kenya

The study examined influence of farmer capacity building in financial resource mobilization on performance of smallholder irrigation projects in Migori County, Kenya. The study adopted pragmatism as its philosophy, and used cross sectional and correlation research design. The target population was 2,815, and comprised farmers from fifteen smallholder irrigation projects that receive water from River Kuja through Lower Kuja Project. The sample size was 341 farmers. The study used systematic random sampling to draw the sample, used questionnaire to collect data, and analyzed data using descriptive and inferential statistics. The results showed that farmer capacity building in financial resource mobilization has a significant influence on performance of smallholder irrigation projects (r = 801, R2 = 0.641, F (5, 331) = 118.405, 0.000 < p < 0.05). Therefore, the study concluded that financial resource mobilization is a critical factor in performance of smallholder irrigation projects in Migori County. Consequently, the study recommends that Migori County Government educate farmers in smallholder irrigation projects on loan facilities by financial institutions. Further, the study recommends that Migori County develop a framework to assist farmers in smallholder irrigation projects to qualify for loans facilities operated by financial institutions.

Assessing Vulnerability to Climate Change in Smallholder Irrigation Schemes of Zimbabwe

Globally, climate change poses enormous threats to the livelihoods of rural communities in arid and semi-arid regions. Assessing the extent of vulnerability is critical to identify climate hot spots and develop appropriate adaptation policies and strategies. This paper uses the Livelihood Vulnerability Index (LVI) and the Livelihood Vulnerability Index—Intergovernmental Panel on Climate Change (LVI-IPCC) to compare vulnerability to climate change in the Exchange, Insukamini, and Ruchanyu smallholder irrigation schemes (SISs) in the Midlands Province of Zimbabwe. A questionnaire was used to collect data from a sample of 317 randomly selected households. Results show higher exposure and sensitivity to climate change in the Insukamini irrigation scheme despite the higher adaptive capacity. Both LVI and LVI-IPCC show that households in Insukamini irrigation scheme are more vulnerable to climate change than in Exchange and Ruchanyu irrigation schemes, attributed to water insecurity, poor social networks, and natural disasters and climate variability. The study recommends that development and investment in Insukamini and Ruchanyu should prioritize improving social networks while Exchange should primarily focus on improving livelihood strategies. Using the LVI-IPCC framework is a key methodology for understanding the vulnerability of communities in SISs and identifying areas that need prime development and investment. These results have implications on implementing investments and livelihood policies in SISs of Zimbabwe.

High-Dimensional Satellite Image Compositing and Statistics for Enhanced Irrigated Crop Mapping

Accurate irrigated area maps remain difficult to generate, as smallholder irrigation schemes often escape detection. Efforts to map smallholder irrigation have often relied on complex classification models fitted to temporal image stacks. The use of high-dimensional geometric median composites (geomedians) and high-dimensional statistics of time-series may simplify classification models and enhance accuracy. High-dimensional statistics for temporal variation, such as the spectral median absolute deviation, indicate spectral variability within a period contributing to a geomedian. The Ord River Irrigation Area was used to validate Digital Earth Australia’s annual geomedian and temporal variation products. Geomedian composites and the spectral median absolute deviation were then calculated on Sentinel-2 images for three smallholder irrigation schemes in Matabeleland, Zimbabwe, none of which were classified as areas equipped for irrigation in AQUASTAT’s Global Map of Irrigated Areas. Supervised random forest classification was applied to all sites. For the three Matabeleland sites, the average Kappa coefficient was 0.87 and overall accuracy was 95.9% on validation data. This compared with 0.12 and 77.2%, respectively, for the Food and Agriculture Organisation’s Water Productivity through Open access of Remotely sensed derived data (WaPOR) land use classification map. The spectral median absolute deviation was ranked among the most important variables across all models based on mean decrease in accuracy. Change detection capacity also means the spectral median absolute deviation has some advantages for cropland mapping over indices such as the Normalized Difference Vegetation Index. The method demonstrated shows potential to be deployed across countries and regions where smallholder irrigation schemes account for large proportions of irrigated area.

Determinants of Farmers’ Participation in the Management of Smallholder Irrigation Schemes in Kwazulu-Natal Province, South Africa

Participatory Irrigation Management is an important concept in the management of water resources. It fosters collective responsibility and rule compliance, the lack of which creates a weak environment for sustainable water use. This study adopted Principal Components Analysis and Structural Equation Modelling to evaluate the determinants of farmer’s participation in the management of four smallholder irrigations schemes in KwaZulu-Natal Province, South Africa. The selected schemes, Ndumo, Makhathini Flats, Mooi River and Tugela Ferry, are representative of the general management and farmer activities in smallholder irrigation schemes in the country. The study considered household data from 341 irrigators and found that those who participated in regulation and control management activities of SIS also participate in information sharing activities. The results show that agricultural training, land tenure security, credit access and co-operative membership positively influence farmers’ participation in decision making. Additionally, irrigation water adequacy positively influences farmer’s participation in making financial contributions in the schemes. The study recommends that better land agreements that, would improve the security of tenure should be put in place to foster farmer participation. Farmers should receive agricultural and irrigation training to increase the likelihood of participating in the management of irrigation schemes.

Nexus Between Smallholder Irrigation Farming and Farmers’ Livelihood Outcomes in Ghana’s Guinea Savannah

The aim of the study was to relate small-scale irrigation farming and farmers’ livelihood outcomes using the poorest District in the Upper West Region of Ghana. The livelihood implications of rural farmers remain inconclusive across the literature. Mixed methods and primary data consisting of key informant interviews, household questionnaires and personal observation were used for the study. Data were obtained from 120 farmers drawn from 173 farming households living in four (4) small-scale irrigation dams’ communities. The results revealed a significant source of supplementary income and household food is provided by smallholder irrigation farming. The results further revealed that farmers employ a plethora of technologies including the use of mulch to stem soil moisture loss, livestock manure and chemical fertilizers to remedy soil productivity decline as well as hand-dug wells to supplement the reduction in irrigation water. However, the results revealed that irrigable land is not accessible to non-land owning ethnic groups. Access to irrigable land should be the number one consideration in siting irrigation facilities in Ghana.